WO2012097500A1 - Procédé de réduction de la consommation d'énergie dans une station de base d'un réseau sans fil - Google Patents

Procédé de réduction de la consommation d'énergie dans une station de base d'un réseau sans fil Download PDF

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Publication number
WO2012097500A1
WO2012097500A1 PCT/CN2011/070349 CN2011070349W WO2012097500A1 WO 2012097500 A1 WO2012097500 A1 WO 2012097500A1 CN 2011070349 W CN2011070349 W CN 2011070349W WO 2012097500 A1 WO2012097500 A1 WO 2012097500A1
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WO
WIPO (PCT)
Prior art keywords
base station
sleeping
neighbouring
terminal
wake
Prior art date
Application number
PCT/CN2011/070349
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English (en)
Inventor
Chan Zhou
Malte Schellmann
Egon Schulz
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/CN2011/070349 priority Critical patent/WO2012097500A1/fr
Publication of WO2012097500A1 publication Critical patent/WO2012097500A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/165—Performing reselection for specific purposes for reducing network power consumption
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the disclosure relates generally to wireless communication, and more particularly to a method for reducing energy consumption in a base station of a wireless cellular network.
  • Future mobile networks will consist of a grid of individually sized radio cells, each one comprising at least one base station with a predetermined service range. Basic coverage of the whole service area is established by macro cell base stations having typically a range of more than 500 m. The network can be extended by femto, pico and micro cells, whose coverage area may overlap. The femto cells have a very small range of only 5-10 m, allowing implementing different cells even within the same building.
  • Medium sized cells comprise pico and micro cells, having ranges typically of about 50-100 m and up to 250 m, respectively.
  • a wireless cellular network can comprise a plurality of cells each having a base station consuming power.
  • a wireless network comprising macro cells, micro cells, pico cells as well as femto-cells is called a heterogeneous network.
  • a heterogeneous network is set up especially for the purpose to satisfy the traffic demand during peak hours; however, most of the time of the day a base station of a non-macro cell is normally in a standby mode and therefore consumes a lot of energy if not being switched off.
  • a network with a sleep node for wireless communication devices during out of service operation is described.
  • a wireless communication device is placed in a deep sleep mode to reduce power consumption of the respective wireless communication device when operating out of service.
  • the power of the wireless communication device is periodically increased to initiate one or more wake-up periods.
  • a service signal search is performed in one or more frequency bands supported by the wireless communication device.
  • the wireless communication device is returned to the deep sleep mode when the service signal search is unsuccessful.
  • a wireless network especially in a dense small cell environment is supposed to support also peak hour data traffic. Normally in most of the time the data traffic demand is much lower than the network capacity, because a conventional wireless network is over dimensioned to cope with any data traffic. Consequently, some base stations in such a wireless network can be superfluous or redundant during times of low data traffic. These redundant base stations not only consume extra energy, but also spread extra signal interference into the radio environment which can disturb the communication between the still active base stations and mobile terminals.
  • the present invention aims to provide a communication network with reduced energy consumption and reduced inter-cell interference of base stations.
  • a method for reducing the energy consumption in a base station of a wireless network comprising the steps of: handing over terminals assigned to said base station to at least one neighbouring base station and switching the base station from an active operation mode into a sleep mode if the respective base station is idle for a predetermined time period; selecting said sleeping base station by at least one terminal being assigned to a
  • the wake-up signal is sent from said neighbouring base station to said selected sleeping base station via an existing backhaul connection which connects the base station with other base stations.
  • This connection may be provided via a radio network controller (R C), e.g. according to 3GPP UMTS or via a core network, e.g. directly according to 3GPP LTE.
  • R C radio network controller
  • the wake-up signal is sent via a separate connection.
  • this extra connection is provided specifically for wake-up signals.
  • the extra connection can be formed either by a wired link or a wireless link between the base stations.
  • the sleeping base station needs in its sleeping state only to power a receiver for such wake-up signals and thus, the power consumption is kept comparably low.
  • said sleeping base station broadcasts pilot signals to provide terminals within its service region with channel state information.
  • pilot signals are broadcasted in a possible embodiment by a pilot broadcast unit of said sleeping base station in large time intervals. This has the advantage to save power in the sleeping base station.
  • these time intervals span a period of at least 10 msec.
  • said wake-up signal of said neighbouring base station is received by a wake-up control unit of said sleeping base station.
  • a terminal being located in a service region of said sleeping base station has a data transfer request for transferring data to a base station and selects based on its current channel state information the sleeping base station as its desired base station said terminal informs the active neighbouring base station to which it is currently assigned about the sleeping base station as its desired base station.
  • the neighbouring base station sends in response to the provided information about the desired base station a wake-up signal to the sleeping base station.
  • This wake-up signal can be sent directly or indirectly.
  • the wake-up signal can be transmitted via an existing backhaul connection between base stations or via a separate connection provided specifically for transmission of wake-up signals.
  • This separate connection can comprise wired or wireless links.
  • a separate connection comprising wireless links for wake-up signal transmission between base stations has the advantage that it is easier to be set-up and easier to be implemented.
  • the active neighbouring base station which has informed said terminal about the data transfer request obtains a selection of a desired base station from said terminal.
  • the active neighbouring base station sends a wake-up signal to said sleeping base station.
  • the terminals handed over by said sleeping base station to at least one neighbouring base station communicate with said neighbouring base station via uplink and/or downlink signalling message channels.
  • the terminals are formed by mobile terminals which can change positions within a service region of the respective base station.
  • the terminals are formed by mobile terminals which change the positions within the service region and which can move out a service region and back into a service region of the respective base station.
  • the idle time period monitored by a control unit of the base station is configurable during operation. This allows adapting the idle time period during operation. In some of such
  • idle time adaptations can for example be performed depending on the density of users within the service area or depending on the speed, with which users are moving within the service area of a base station. Further, the adaptation can for example be influenced from the respective situation in the service area of a neighbour base station. In a still further implementation form of the first aspect of the present invention the idle time period monitored by a control unit of the base station is preconfigured.
  • a base station for a wireless network comprising:
  • control unit which hands over terminals assigned to said base station to at least one neighbouring base station and switches the base station from an active operation mode to a sleeping mode if said base station is idle for a configurable time period;
  • the wake-up signal is sent from said neighbouring base station to said selected sleeping base station via an existing backhaul connection which connects the base station with the other base station.
  • the wake-up signal is sent via a separate extra connection which can be specifically provided for wake-up signals.
  • This extra connection for transport of wake-up signals can be formed by a wired link or a wireless link.
  • the base station comprises a pilot broadcast unit which broadcasts pilot signals in said active operation mode and in said sleeping mode to provide terminals within a service region of said base station with channel state information.
  • the base station comprises a paging/listening unit which is switched off by said control unit in said sleeping mode and which is switched on by said control unit in said active operation mode.
  • the base station comprises a power supply unit.
  • the power supply unit of the base station is connected to a power supply network.
  • the power supply unit of the base station forms a stand-alone power supply unit.
  • the invention provides a wireless network comprising at least two cells each having at least one base station,
  • said base station comprising a control unit which hands over terminals assigned to said base station to at least one neighbouring base station and switches the base station from an active operation mode to a sleeping mode if said base station is idle for a configurable time period and which switches the sleeping base station back into the active operation mode if the control unit receives a wake-up signal from a neighbouring base station.
  • the wake-up signal is sent from said neighbouring base station to said selected sleeping base station via an existing backhaul connection which connects the base station with other base stations.
  • the wake-up signal is sent via a separate extra data connection which can be formed by a wireless or wired link between the base stations.
  • the wake-up signal can be sent from the neighbouring base station to said selected sleeping base station directly or indirectly via other network entities.
  • the base station of the cellular wireless network comprises a pilot broadcast unit which broadcasts pilot signals in said active operation mode and in said sleeping mode to provide terminals within a service region of the base station with channel state information.
  • the base station of said wireless network comprises a paging/listening unit which is switched off by said control unit in said sleeping mode and which is switched on by said control unit in said active operation mode.
  • the base station of the wireless network comprises a power supply unit connected to a power supply network or forming a stand alone power supply unit.
  • the above techniques may be implemented in hardware, software, firmware or any combinations thereof. Implemented in software the techniques may be realized in part by a computer readable medium comprising a program code containing instructions which, when executed, perform one or more of the methods described herein.
  • Fig. 1 shows a block diagram illustrating a wireless network comprising base stations which are capable of reducing power consumption according to an exemplary implementation of an aspect of the present invention
  • Fig. 2 shows a diagram illustrating an exemplary embodiment of a wireless communication network with different cell sizes employing base stations which are capable of reducing power consumption according to an aspect of the present invention
  • Fig. 3 shows a block diagram of components in an exemplary implementation of a base station which is capable of reducing power consumption according to an aspect of the present invention
  • Fig. 4 shows a state diagram illustrating a possible implementation form of a base station comprising different operation modes according to an aspect of the present invention
  • Fig. 5 shows a signal diagram illustrating a communication between
  • Fig. 6 shows a flowchart illustrating an exemplary possible implementation of a method for reducing energy consumption in a base station according to an aspect of the present invention
  • Fig. 7 shows a block diagram for illustrating a possible exemplary
  • Fig. 1 shows a block diagram illustrating an exemplary wireless network 1 comprising several base stations 2-0, 2-1, 2-2.
  • a mobile terminal 3 is assigned to the base station 2-0 being connected via a connection 4 to further base stations of the wireless network 1.
  • the base stations 2-1, 2-2 form neighbouring base stations of the base station 2-0 to which the mobile terminal 3 is assigned.
  • the number of neighbouring base stations can vary, i.e. one base station can have one or more neighbouring base stations.
  • the topology of the connection 4 can also be different in different implementations, e.g. bus structure, ring topology or e.g. star topology.
  • the connection 4 can be connected to further components or networks (not shown in Fig. 1).
  • connection 4 can be formed by an existing backhaul or backbone connection 4.
  • connection 4 can be formed by additional separate links set up in addition to existing connections and provided for transmitting wake-up signals from one base station to another base station. These links can be formed by wireless or wired wake-up links provided for transmission of wake-up signals.
  • RNC radio network controller
  • the mobile terminal 3 shown in Fig. 1 communicates with its assigned base station 2-0 via a wireless link.
  • the mobile communication device 3 shown in Fig. 1 can take the form of a mobile radio telephone, satellite radio telephone, a wireless communication card incorporated within a portable computer, a personal digital assistant (PDA) equipped with wireless communication capabilities or a mobile phone.
  • Each base station 2-i can also be referred to as a base transceiver system (BTS) including a controller that provides an interface between the base station and a backhaul connection or a backbone network.
  • the wireless network 1 can be a wireless cellular network implemented by different technologies such as UMTS, LTE, GSM, GPRS, WIMAX or the like.
  • the wireless link can also be implemented by different kind of technologies such as Bluetooth or ZigBee.
  • each base station 2-i of the wireless network 1 shown in Fig. 1 comprises a control unit which can perform a handover of terminals assigned to the respective base station to at least one neighbouring base station.
  • the control unit hands over terminals assigned to the base station to at least one neighbouring base station if said base station is idle for a configurable time period.
  • the base station 2-0 to which the mobile terminal 3 is assigned can handover the terminal 3 assigned to the base station 2-0 to one of its neighbouring base stations 2-1, 2-2 if the base station 2-0 is idle for a configurable time period.
  • the idle time period is monitored by the control unit of the base station 2-0 for example by means of a sleep timer.
  • the control unit of the base station 2-0 performs the handover of terminal 3 to one of its neighbouring base stations 2-1, 2-2 and switches the base station 2-0 from an active operation mode to a sleeping mode.
  • the base station 2-0 comprises a local data memory including a list of neighbouring cells or neighbouring base stations 2-i.
  • the base station 2-0 can identify the neighbouring base stations by means of the respective addresses of the base stations in the backhaul network or backhaul network segment. Before the base station 2-0 is switched into the sleep mode all terminals 3 assigned to the respective base station 2-0 are handed over to neighbouring base stations.
  • a plurality of terminals 3 can be assigned which are assigned to the same or different neighbouring base stations in case that the corresponding base station is switched to the sleep mode.
  • the terminals 3 are assigned to those neighbouring base stations 2-i providing the best channel quality according to channel state information CSI. This is determined by each terminal individually, i.e. each terminal is assigned to its individual neighbouring base station.
  • the channel quality can comprise different parameters such as signal to noise ratios SNRs. For example, if the control unit of base station 2-0 detects that the base station 2-0 is idle for a configurable time period may assign the terminal 3 to its neighbouring base station 2-1 because the neighbouring base station 2-1 provides a communication link of a good signal quality to this mobile terminal 3.
  • the control unit provided within the base station 2-0 switches the sleeping base station 2-0 back into the active operation mode if the control unit receives a wake-up signal from a neighbouring base station via the connection 4.
  • the idle time period monitored by the control unit of the base station can in a possible embodiment be preconfigured. In a still further implementation the idle time period monitored by the control unit of the base station can also be adaptable during operation.
  • the base station 2-0 is turned into a sleep mode if there is no transmit/receive request for data transport for any of its assigned subordinate terminals 3. In the sleep mode power to most components of the base station is cut off except for the wake-up control unit and a pilot broadcast unit of the respective base station.
  • the wake-up control unit of the base station If the wake-up control unit of the base station receives a wake-up signal from a neighbouring base station it switches the base station back into the active operation mode. After the base station 2-0 has handed over its assigned terminals 3 to one or several neighbouring base stations and has switched to the sleep mode the base station 2-0 does not execute listening operations.
  • the base station 2-0 only broadcasts pilot signals in comparatively large time intervals, e.g. time intervals comprising more than 10 msec.
  • the sleeping base station 2-0 broadcasts these pilot signals to provide terminals 3 within its service region with channel state information CSI.
  • the base station 2-0 operating in the sleeping mode cannot be involved in any handover operations as long as there is no data transmission request within its service region triggering a wake-up of the sleeping base station.
  • a terminal such as terminal 3 in Fig. 1 assigned to a neighbouring base station 2-1 being located in a service region of the sleeping base station 2-0 can select the sleeping base station 2-0 according to channel state information CSI of the terminal 3.
  • the sleeping base station 2-0 is selected by the terminal 3 and the selected sleeping base station 2-0 can be re-activated by the neighbouring base station 2-1 to which the selecting terminal 3 is currently assigned by sending a wake-up signal from the neighbouring base station 2-1 via the connection 4 to the selected sleeping base station 2-0. If the control unit of the sleeping base station 2-0 receives the wake-up signal it switches the sleeping base station 2-0 back into the active operation mode.
  • a terminal 3 being located in the service region of the sleeping base station 2-0 has a data transfer request for transferring data to a base station and selects based on its current channel state information CSI the sleeping base station 2-0 as its desired base station the terminal 3 can inform the active neighbouring base station 2-1 to which it is currently assigned about the sleeping base station 2-0 as its desired base station. In response to this information the neighbouring base station 2-1 sends a wake-up signal via the connection 4 to the sleeping base station 2-0.
  • the neighbouring base station 2-1 may not only get a data transfer request DTR for transferring data from the terminal 3 to a base station but also a data transfer request DTR for transferring data to a terminal 3 located in the service region or vicinity of the sleeping base station 2-0.
  • a data transfer request DTR for transferring data to a terminal 3 located in the service region of the sleeping base station 2-0 is received by the active neighbouring base station 2-1 to which the respective terminal 3 is currently assigned the active neighbouring base station 2-1 informs the terminal 3 about the received data transfer request DTR and can obtain a selection of a desired base station from the respective terminal 3. If the desired base station selected by the terminal 3 is the sleeping base station 2-0 the active neighbouring base station 2-1 sends also in this case a wake-up signal via the connection 4 to the sleeping base station 2-0.
  • the terminal or terminals 3 handed over by said sleeping base station 2-0 to the neighbouring base station 2-1 can communicate in a possible implementation with the neighbouring base station 2-1 via uplink and/or downlink signalling message channels.
  • These signalling message channels or control channels can comprise in a possible implementation a RACH uplink signalling channel.
  • the downlink signalling message channel can comprise a paging channel.
  • the neighbouring base stations that dropped the mobile terminals 3 to another base station such as base station 2-0 can hear the terminals via an uplink signalling channel such as RACH.
  • the assigned terminals 3 are also able to receive signalling messages from these neighbouring base stations.
  • a terminal 3 which is located in the service region of a sleeping base station such as base station 2-0 and has a data transfer request DTR first sends the data transfer request DTR to the next active base station. At the same time the terminal 3 informs the active neighbouring base station which base station, e.g. the sleeping base station, it wants to be connected with. The terminal 3 always has the most updated channel state information CSI thanks to the previous pilot signal measurement. The terminal 3 can select the desired base station according to its channel state information data. If there is incoming data traffic for a terminal 3 located in the service region of the sleeping base station 2-0 the data transfer request DTR is first sent to the neighbouring base station currently connected to the respective terminal 3. The neighbouring base station 2-1 informs the terminal 3 about the data transfer request DTR and obtains the selection of a favorable base station from the terminal 3.
  • Fig. 2 shows a diagram for illustrating a possible exemplary embodiment of a wireless network 1 according to the present invention.
  • the wireless network 1 according to the present invention can be a cellular network comprising a plurality of cells 5-i each comprising at least one corresponding base station 2-i.
  • the size of the cells 5-i can vary.
  • the network 1 can comprise macro cells such as cell 5-4, micro cells such as cell 5-0, pico cells such as cell 5-2 but also femto cells such as cells 5-1, 5-3. Cells may overlap each other.
  • the network 1 can comprise base stations 2-i in which a method for reducing the energy consumption according to an aspect of the present invention is implemented but also conventional base stations.
  • not all base stations 2-i have necessarily to comprise a control unit which switches the respective base station into a sleep mode if the base station is idle for a configurable time period. This allows implementing the present invention gradually in already existing conventional wireless networks.
  • Fig. 3 shows a block diagram of an exemplary implementation of a base station 2 according to an aspect of the present invention.
  • the base station 2 comprises in the shown implementation a control unit 2A connected to a connection 4.
  • the connection 4 can be formed by a link of an existing backhaul or backbone connection. It is possible that the connection 4 is formed by a separate additional connection provided for transmitting wake- up signals between base stations. These wake-up links can be formed by wired or wireless links.
  • the base station 2 can further comprise a local memory 2B which can comprise a list of neighbouring cells 5 and/or neighbouring base stations 2. Furthermore the local data memory 2B can comprise a list or table of assigned terminals 3 assigned to the respective base station 2.
  • the base station further comprises in the shown implementation a pilot broadcast unit 2C and a paging/listening unit 2D.
  • the control unit 2A, the data memory 2B as well as the pilot broadcast unit 2C and the paging/listening unit 2D can be supplied with energy by a power supply unit 2E of the base station 2.
  • the pilot broadcast unit 2C and the paging/listening unit 2D can be connected to an antenna 2F.
  • the antenna 2F is used to transmit signals as well as to receive signals.
  • the control unit 2A shown in Fig. 3 hands over terminals 3 assigned to the base station 2 to the neighbouring base stations and switches the base station 2 from an active operation mode to a sleeping mode if said base station 2 is idle for a configurable time period.
  • control unit 2A can comprise a timer for monitoring an idle time of the base station 2.
  • the timer can be implemented by a counter.
  • the control unit 2 A switches the sleeping base station 2 back into the active operation mode if the control unit receives a wake-up signal from a neighbouring base station via the connection link 4 as shown in Fig. 3.
  • the pilot broadcast unit 2C broadcasts in the active operation mode pilot signals to provide terminals 3 within the service region with channel state information CSI.
  • the pilot broadcast unit 2C remains active and still sends broadcast pilot signals to the surrounding.
  • the pilot broadcast 2C transmits in a possible implementation pilot signal in large time intervals only to save power. These time intervals can span at least 10 msec or even several seconds.
  • the time intervals between pilot signals transmitted during sleep mode can also be configured.
  • the time intervals between pilot signals broadcasted by the base station 2 during sleep mode can be adapted during operation.
  • the time intervals for sending pilot signals can be reduced by the control unit 2A sending a corresponding internal control signal to the pilot broadcast unit 2C instructing the pilot broadcast unit 2C to increase the time interval for sending a pilot signal.
  • the pilot signal can comprise a predetermined signal pattern known to the terminals 3.
  • the power supply unit 2E of the base station 2 as shown in Fig. 3 can in a possible implementation be connected to a power supply network.
  • the supply unit 2E can form a stand-alone power supply unit.
  • This stand-alone power supply unit can be a rechargeable battery and/or a solar cell.
  • the base station 2 can be located in an area where no power supply network is accessible.
  • this embodiment allows locating easily additional base stations 2 in an area where many terminals 3 have to be served.
  • the base station 2 can comprise a local stand-alone power supply unit and additionally a power supply unit connected to a power supply network.
  • a base station 2 can be still operated if the power supply network is failing or is disturbed.
  • a possible power supply network is failing or is disturbed.
  • the time interval for sending a pilot signal by the pilot broadcast unit 2C can depend on the service range of the base station 2 and a moving speed of the terminals 3 moving within the service range of the respective base station.
  • the terminals 3 can be formed in a possible implementation by mobile terminals which change the positions within a service region of the base station 2. The terminals 3 can even move out of the service region and back into the service region of the base station.
  • the velocity and/or speed of mobile terminals 3 with changing positions can vary for different applications.
  • the velocity of the terminals 3 can be measured and the time interval for sending the pilot signal can be adapted accordingly.
  • a possible implementation the time interval for sending a pilot signal by the pilot broadcast unit 2C can depend on the service range of the base station 2 and a moving speed of the terminals 3 moving within the service range of the respective base station.
  • the terminals 3 can be formed in a possible implementation by mobile terminals which change the positions within a service region of the base station 2. The terminals 3 can even move out of the service region and back into the
  • Fig. 4 shows a state diagram to illustrate a base station 2 according to an aspect of the present invention having two operation modes.
  • the base station 2 for a wireless network according to an aspect of the present invention can be switchable between an active operation mode and a sleeping mode.
  • a monitored idle time period AtiDLE exceeds a threshold time tjH the base station 2 switches from the active operation mode to the sleeping mode. In the sleeping mode the
  • paging/listening unit 2D of the base station 2 as shown in Fig. 3 can be switched off by the control unit 2A. Further the pilot broadcast unit 2C can broadcast pilot signals with a lower frequency, i.e. longer time intervals, in the sleeping mode. By switching off the
  • the control unit 2 A of the base station 2 receives a wake-up signal from a neighbouring base station via the connection 4 the base station 2 returns to the active operation mode as illustrated by Fig. 4.
  • the base station 2 may comprise more than two operation modes.
  • the base station 2 may comprise different sleeping modes or levels of power saving.
  • the control unit 2A may monitor the idle time of the base station 2 and compare it to several threshold values wherein with increasing idle time the time intervals of the pilot broadcast signal are increased.
  • the wake-up signal switching the base station 2 from the sleeping mode to the active operation mode might come from another source than the neighbouring base station, for example from a central control unit of the network 1. This allows switching on remotely the sleeping base station 2 by the central control unit of the network 1.
  • the base station 2 can comprise a user interface having input means for manually switching the base station between different operation modes.
  • Fig. 5 shows a signal diagram for illustrating an exemplary embodiment of a method for reducing energy consumption in a base station 2 of a wireless network according to a possible implementation of an aspect of the present invention.
  • a terminal such as terminal 3 in Fig. 1 is connected via a wireless link to a base station 2-0 having at least one neighbouring base station 2-1 wherein both stations are connected by means of a connection 4.
  • the terminal 3 is initially assigned to the base station 2-0.
  • the terminal 3 can send a data transmission request DTR to the listening base station 2-0 and send then data via a data communication channel to the base station 2-0.
  • the base station 2-0 forwards the received data to the connection 4 where it is transported to a destination device.
  • a source device wishes to send data to the terminal 3 assigned to the base station 2-0 it can send via the connection 4 a data transmission request DTR to the base station 2-0 which forwards the received data request DTR to the assigned terminal 3 (paging). Then, the data received by the base station 2-0 from the backhaul connection 4 is transmitted to the terminal 3 in a wireless downlink.
  • the base station 2-0 comprises a control unit 2A which monitors in a possible
  • implementation operations performed by the base station 2-0 such as forwarding data transfer requests to terminals or forwarding data transfer requests from terminals to the connection 4.
  • another operation can be performed by the base station 2 in the normal active operation mode such as sending data in a downlink
  • the control unit 2A of the base station 2-0 performs a handover of all terminals 3 assigned to the base station 2-0 to one or several neighbouring base stations such as neighbouring base station 2-1 as shown in Fig. 5.
  • the terminal 3 is handed over by base station 2-0 to base station 2-1.
  • the control unit 2A of the base station 2-0 switches the base station 2-0 from the normal active operation mode to the sleep mode.
  • the paging/listening unit 2D of the base station 2-0 is switched off to save power.
  • Only the pilot broadcast unit 2C broadcasts pilot signals in a configurable broadcast time interval to provide terminals 3 with channel state information CSI.
  • the time interval Atps-sLEEP is in a possible
  • the terminal 3 as shown in Fig. 5 is located still in the service region of the base station 2-0 and id it has a data transfer request DTR for transferring data to a base station, it can select based on its current channel information CSI provided by the previous pilot signal measurement the sleeping base station 2-0 as its desired base station. The terminal 3 then informs the active neighbouring base station 2-1 along with the data transfer request DTR about the sleeping base station 2-0 as its desired base station. If the neighbouring base station 2-1 receives a data transfer request DTR from a terminal 3 along with the information that the desired base station of this terminal 3 is another sleeping base station such as the sleeping base station 2-0, it sends a wake-up signal via the connection 4 to the selected base station, i.e.
  • the selected sleeping base station 2-0 as shown in Fig. 5. If another data transfer request DTR for transferring data to a terminal 3 located in the service region of the sleeping base station 2-0 is received by the active neighbouring base station 2-1 to which the terminal 3 is currently assigned the active neighbouring base station 2-1 informs the terminal 3 about the data transfer request and obtains a selection of the desired base station from the respective terminal 3. If in this case the desired base station selected by the terminal 3 is the sleeping base station 2-0 the active neighbouring base station 2-1 sends also a wake-up signal via the backhaul connection 4 to the sleeping base station 2-0.
  • the control unit 2A provided within the base station 2-0 activates the selected sleeping base station 2-0 which switches the base station 2-0 back into the active operation mode.
  • the sleeping base station 2-0 has been reactivated a handover is performed and the terminal 3 is handed off by the neighbouring base station 2-1 to the base station 2-0 as shown in Fig. 5.
  • the terminal 3 is assigned to the base station 2-0.
  • Fig. 6 shows a simple flowchart of a possible exemplary embodiment of a method for reducing the energy consumption in a base station 2 of a wireless network according to an aspect of the present invention.
  • a base station 2 is idle for a predetermined time period the terminals 3 assigned to the base station 2 are handed over to at least one neighbouring base station and the respective base station is switched from an active operation mode into a sleep mode.
  • the sleeping base station is selected by at least one terminal 3 assigned to a neighbouring base station and being located in a service region of the sleeping base station according to channel state information CSI of the respective terminal 3.
  • a further step S3 the selected sleeping base station 2 is reactivated by the neighbouring base station to which the selected terminal is currently assigned by sending a wake-up control signal from the neighbouring base station via a connection 4 to the selected sleeping base station 2.
  • Fig. 7 shows a diagram for illustrating an exemplary implementation of a base station 2 for a wireless network according to a possible aspect of the present invention.
  • the base station 2 comprises a stand alone power supply unit 2E which comprises a plurality of solar cells to supply the base station 2 with energy.
  • the base station 2 is connected for example a backhaul link 4 to a backbone network.
  • a terminal 3 within the service range of the base station 2 can communicate with the base station 2 via wireless link.
  • the backhaul link 4 can also be formed by a wireless link.
  • the stand-alone power supply unit 2E as shown in Fig. 7 can also be connected to a rechargeable battery so that a power supply is also provided when the solar cells do not produce sufficient electrical energy.
  • the base station 2 does not need a direct connection to a power supply network and can be transported easily to another location.
  • the terminals 3 are able to receive incoming calls and to make outgoing calls any time. If a location of a terminal 3 has been changed the system knows which base station 2 is currently responsible for the
  • the present invention allows reducing an energy consumption and frequency usage of the base stations 2.
  • a base station 2 which is switched into the sleep mode only broadcasts pilot signals with large time intervals, so that signal interference for the data
  • the method can be applied to micro and macro cell environments.
  • the method according to the present invention is suitable or a dense small cell environment.
  • the components described herein can be implemented in hardware, software, firmware or any combination thereof. Any features described as modules or components can be implemented together in an integrated device or separately as discrete but interoperable devices. If implemented in software the components can be realised in part by a computer readable medium such as a memory device comprising a program code containing instructions that, when executed, perform one or more of the method described above.
  • the computer readable medium can comprise a random access memory such as synchronous dynamic random access memory, a read only memory ROM, a non-volatile random access memory, electrically erasable programmable read only memories, flash memory or magnetic or optical data storage media and the like.
  • the program code implementing a method according to an aspect of the present invention may be executed by one or more processors such as one or more digital signal processors, general purpose micro processors, an application specific integrated circuit ASIC, field programmable logic arrays FPGA or other equivalent integrated or discrete circuitry.
  • processors such as one or more digital signal processors, general purpose micro processors, an application specific integrated circuit ASIC, field programmable logic arrays FPGA or other equivalent integrated or discrete circuitry.
  • the method and base station according to the present invention can be used in any kind of wireless networks and are not restricted to the use in cellular wireless networks.
  • the wireless network can comprise a local area network, a media range area network and a wide area range network.
  • the network 1 can also be a heterogeneous network comprising different kind of base stations and cells of different sizes.
  • the network 1 can comprise self organizing mechanisms such as adjusting time intervals for broadcasting pilot signals in response to measured or calculated moving speeds of mobile terminals 3.
  • the terminals 3 assigned to a base station 2 can comprise mobile terminals but also terminals having a fixed location.

Abstract

La présente invention porte sur un procédé de réduction de la consommation d'énergie dans une station de base (2) d'un réseau sans fil (1) comprenant les étapes consistant à transférer (S1) des terminaux (3) attribués à ladite station de base (2-0) à au moins une station de base voisine (2-1) et commuter la station de base (2-0) d'un mode de fonctionnement actif à un mode de sommeil si la station de base respective (2-0) est inactive pendant une période de temps prédéterminée (ΔtIDLE); sélectionner (S2) ladite station de base en sommeil (2-0) par au moins un terminal (3) qui est attribué à une station de base voisine (2-1) et se trouve dans une région de desserte de ladite station de base en sommeil (2-0) conformément à des informations d'état de canal (CSI) dudit terminal (3); et réactiver la station de base en sommeil sélectionnée (2-0) par la station de base voisine (2-1) à laquelle le terminal de sélection (3) est actuellement attribué par envoi d'un signal de réveil de ladite station de base voisine (2-1) à ladite station de base en sommeil sélectionnée (2-0).
PCT/CN2011/070349 2011-01-18 2011-01-18 Procédé de réduction de la consommation d'énergie dans une station de base d'un réseau sans fil WO2012097500A1 (fr)

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CN111487579A (zh) * 2019-01-28 2020-08-04 上海七桥机器人有限公司 针对可移动设备的测距方法及设备
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CN111487579A (zh) * 2019-01-28 2020-08-04 上海七桥机器人有限公司 针对可移动设备的测距方法及设备
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